Upgrade pylint version to 3.1.1 and fix pylint issues in that version

Change-Id: Ibf16dc9af6b528a3d3fef38bd038519fa65966e2
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/n2vc/libjuju.py b/n2vc/libjuju.py
index f36ff39..8139a4e 100644
--- a/n2vc/libjuju.py
+++ b/n2vc/libjuju.py
@@ -972,9 +972,11 @@
                 for unit in application.units:
                     if (
                         unit.workload_status == "error"
-                        and unit.workload_status_message != ""
+                        and unit.workload_status_message != ""  # pylint: disable=E1101
                     ):
-                        error_message = unit.workload_status_message
+                        error_message = (
+                            unit.workload_status_message  # pylint: disable=E1101
+                        )
 
                 message = "Application {} failed update in {}: {}".format(
                     application_name, model_name, error_message
@@ -1017,7 +1019,7 @@
                             )
                         )
                         try:
-                            await unit.resolved(retry=False)
+                            await unit.resolved(retry=False)  # pylint: disable=E1101
                         except Exception:
                             pass